Ed is going to cut the cable. He installed an antenna and now, he can't seem to get a signal because his old TV is analog. Leo says you can get a digital adapter that will bring in the digital signal and convert it to an analog signal. Is there a portable one? Walmart sells them for around $10-30 dollars. There's even one that records. Any DVR that has an analog out will do it as well.
Two good sites to help you - TVFool.com and AntennaWeb.org. You'll be able to enter your address and it will give you a list of channels you can get and what antenna would be best for you.